Flat Roof Insulation Depth

There are two types of flat roof.

Flat roof insulation depth. Roofing insulation is one of the most important and misunderstood building components. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. Cold roofs and warm roofs.

The flat roof overhead is framed in full depth 2x6s finished with what jordan believes is roll roofing a type of asphalt roofing. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. It takes into account the size of the sample and the overall change of temperature over time so that you can compare thermal conductivity of materials tested with plates of different temperatures or even that were tested by other methods. The typical u value of an existing uninsulated flat roof is 1 5w m2k.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. It should be of the maximum available thickness. To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity. Such an insulating solution involves applying several layers of pur foam with each layer around 1 2 cm thick.

There are many different types and installation methods out there along with a lot misinformation about which products offer the greatest energy savings. The target should be to achieve a u value of 0 25w m2k or better. Closed cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.

Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product. With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. The effective roof insulation layer may range in thickness from 3 to 12 cm as needed.

My issue is how to correctly insulate the ceiling he writes in a q a post. Here we share the most common mistakes people make when installing flat roofing insulation.